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    <h1>数列小工具</h1>
    <!--  1/1 + 1/2  -->
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        例如：1/1+1/2+1/3+1/4....1/N<br>
        就写成: 1/n
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        <input type="text" class="userInput lineInput" placeholder="请输入含有i的表达式">
        <input type="text" class="N lineInput" placeholder="要求的前多少项N？默认是前100项之和">
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